If you have a Galaxy Nexus you may notice with the OLED screen it tends to get burned in images of whatever is on your screen the most, like the clock or keyboard, and can even occur if you accidentally leave the screen on in your pocket cause it to get warm and burn the image to your screen. I have a simple fix to reverse these effects. Simply download Dead Pixel Detect and Fix, run it, leave your screen on, and put it in your pocket. This will warm up the screen and remove those ghosting images. I recommend doing this to the phone when you first get it so you never have this problem. Just leave it in your pocket for 30 minutes when you discover this problem, or when you first get the phone. Been going strong with no more ghosting after 3 months. Give it a try.